Removable air-cooled and insulated slag pot



March 12, 1940. G 5 ET AL 2,193,403

REMOVABLE AIR-COOLED AND INSULATED SLAG POT Filed April 17, 1939 3 Sheets-Sheet 1 I We n 014/ Mild! 1940- H. F. GIBBS El AL 2,193,403

REMOVABLE AIR-COOLED AND INSULATED SLAG POT Filed April 17, 1939 s Sheets-Sheet 2 G. /7 Era 1172,

March 12, 1940- H. F. GIBBS ET AL REMOVABLE AIR-COOLED AND INSULATED SLAG POT Filed April 17; 1939 s Sheets-Sheet s grwwvtow,

- Patented Mar. 12,1940

uNiTiEo STATES REIHOVABLE AIR-COOLED, INSULATED SLAG POT I Harry Fulton Gibbs, Warren, and George A.

Braun, Cortland, Ohio Application April 17, 1939,. Serial No. 268,410 8 Claims. (o1. 263-45) This invention relates to open hearth furnaces and has special reference to a furnace slag pot and operating means therefor.

One important object of the invention is to provide a novel arrangement of insulated slag pot to prevent the crystallization of the slag, the warping of the outside steel walls and to prevent the fire brick lining of the-pot from sticking to the bottom of the chamber whereby it is made easier to remove the slag from the slag chamber of the furnace.

A second important object of the inventionis to provide a novel and improved means whereby the slag pot of the character above mentioned can be readily removed from the slag chamber and replaced therein.

A'third important object of theinvention is bottom, sides and ends are held together in such manner that they can be easily disassembled to leave the mass of slag free for removal by a ,crane or otherwise.

With the above and other objects in view, as Will be presently apparent, the invention consists in general of certain novel details :of construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out ,in the appended claims. y

In the accompanying drawings, like characters of reference indicate like parts in the several views, and

Figure 1 is a front elevation disclosing certain slag receiving chambers of an open hearth furnace.

Figure 2 is a section on the line 22 of Figure 1 but with the slag pot shown inelevation.

Figure 3 is an enlarged detailed section on the line 33 of Figure 2. V

Figure 4 is a transverse section through the sla p t showing the arrangement of the sides and bottom and the fire brick lining therefor, other parts of the pot being omitted.

Figure 5. is an enlarged detailed section of the line 55 of Figure 2.

Figure 6 is an enlarged detailed section of the. line 66 of Figure 2.

Figure '7 is a section of the line '!,.I of Figure 6.

Figure 8 is an enlarged detailed section shove ing a portion of a supporting rail for the pot, a portion of the bottom of the pot, the supporting wheel and the stop member for holding the pot in the chamber.

Figure 9 is a section on the line 99 of Fi ure 8.

In the embodiment of the'invention as herein set forth there is provided a furnace, indicated in general at I0, of the open hearth type. For the purposes of this invention the only part of the furnace necessary to be shown is the front wall'and'the slag opening thereof and as seen best in Figure 2 the furnace wall ill is provided with a notch wherethrough a slag floor I l passes to a delivery lip l2. This delivery lip I2 is carriedby asupporting structure l3 wherein is formed-an air or cooling passage M. At the upper forward portion of the structure i3 there is provided anoverhanging ledge it which supports the forward end of the lip l2 and at the same time, as will be presentlyexplained, forms to provide a novel form of slag pot wherein the a sealing device for the slag pot.

The front wall of the slag chamber is indicated generally at l6 and between this front wall and the wall It; is located the slag receiving chamber indicated at H. Inthe wall l6, as here illustrated, there is provided, a pair of openings l8 and [9,1 these openings being substantially alike but of different sizes. Obviously the sizes of the openings are not important in the conwall I6 is a floor 23 and the rails 22 extend forwardly over this floor. The Wall l6 above each of the openings [8 and I9 is supported by anarch 24 which has its upper part filled with brick work 25. Across the bottom of the brick work 25 extends a supporting plate '26. Just below the plate 26 the side walls are corbelled out as at Hand the projecting portion is provided with an inclined face 28 so that a flat brick work member 29 may extend between the faces 28 and rest thereon to close a portion of the opening below the plate 26. 1

The slag pot is indicated in general at 30 and consists of a metal shell and fireclay or firebrick lining therefor. The metal shell comprises a bottom portion 31 having a peripheral flange 32. Upon the bottom 3| are seatedthe side members 33'and the end members 34. The side members 33- may consist of two or more sections each and when made of more than a single piecethese sections are each provided, as shown in Figure 5, with out-turned flanges 35 at their abutting ends. The flanges 35 are provided with registering. openings 36 for the reception of a head and pin 31 having a projecting end provided with an opening 38 wherethrough passes a wedge pin 39 forcing the flanges together and holding the parts securely assembled. At the end of each side there is provided an out-turned flange 4B and end 34 and flange 40 are provided with registering openings 4| for the reception of pins 42 of the same character as the pin 31..

By this means the entire side and end structure is held firmly together but yet may be taken apart for the removal of any slag in the pot. In order to prevent damage to the metal shell of this slag pot the bottom, side walls and end walls are provided interiorly with an insulating coating of fireclay or brick such as is shown at 43.

On the bottom 3! are secured pairs of L shaped brackets 44 the brackets being fastened to the bottom 3! by means of suitable bolts 45. These brackets are so arranged that each pair supports an axle 4B whereon is mounted a wheel or roller 4'! which engages on the uppersurface of the I beam or rail 22. Thus the slag pot can be readily moved on these rails.

From an inspection of Figure 2 it will be noted that the bottom part of the slag pot inclines parallel to the rail while the upper edge of the slag pot is horizontal. Due to this construction the forward end of the slag pot is deeper than the rear end thereof. The corbels 2'5 extend from the wall It to the overhang l5 and the lower spaces of these corbels are in the same plane as the underside of the overhang I5 and the bottom of the member 29. Thus when the slag pot is inserted in the slag chamber the front part of the pot engages under the member 29 while the rear part thereof engages under the overhang I5. At the same time the side Walls engage beneath the lower surface of the corbels 27 on each side. By reason of the inclined ramp structure this engagement is accompanied by a wedging action which makes the joint between the pot 30 and the upper part of the slag chamber practically air-tight.

In order to assist the sealing of the sides of the slag pot the side walls of each slag chamber are provided with ledge members 48 spaced be low the corbels 28 and on these ledge members is formed a fire clay or fire brick seal 49 which runs along the fire side of the chamber. This fire clay 49 presses against the side 33 and thus assists in sealing.

In order to hold the pct 30 in its position with- I in the chamber there is provided for each rail 22 a stop member consisting of a pair of brackets having U shaped portions 50 and upstanding legs 5!, the U shaped portions embracing upper flanges of the I beam 22 while the legs 5! engage against the outer face of the wheel 4! running on the particular rail. Legs 5i are pulled together by means of a suitable bolt '52 and thus the stop member is clamped on the rail but at the same time may be readily removed therefrom or slid therealong by loosening the bolt 52. Y

' Naturally these slag pots are of considerable weight and in order to pull the pot up the rail 22 there is provided in the passage M a winding drum 53 driven by suitable means not deemed necessary here to be shown. On this winding drum is wound a pull chain 54 which is provided at each end with a hook 55 engaging in an eye 56 formed on the forward end of the bottom of the pot 30. Furthermore it may happen that due to the wedging action of the pot when inserted in the chamber I'l difficulty is experienced in starting it down the rail 22. In order to assist such starting an eye 51 is provided in the front end of the pot 3D to receive a hook 58 formed on the forward end of the chain 59 which runs under or around a suitable idler sheave 60. By means of the apparatus just described it will be seen that upon the chain 54 being wound on the drum 53 the pct 30 will be pulled into positionand firmly wedged. Furthermore'it will be seen that when it is desired to remove the pot any pull on the chain 59 will effect such removal.

It will be observed from Figures 1 and 2 that the. pot 30 is spaced from the walls of the slag chamber as shown at l8 and I9. is provided a dead-air space which extends around the slag pot and cools the pot and also the Wall.

It will furthermore be observed that the wall If, shown best in Figure 2, provides a highly efficient means of outlet for gases, so as to increase the dead-air space which will not only strengthen the furnace and the slag pot, but at the same time, make the entire process of steel production more efficient.

It will now be plain that the slag flowing over the lip l2 will drop directly into the pct 30 and, due to the construction and wedging action of the pot, the latter forms a removable bottom for the chamber I! which is so sealed against the upper part of the chamber that no gases nor air can escape through the opening in the wall 19 so long as the pot is in position. Obviously, the pot will not be withdrawn from the chamber at times when the blast is on the furnace but only at those times in which the blast is off. Consequently no noxious gases will escape to injuriously affect the workers in front of the furnace. In using the device when the pot is withdrawn it is often possible to lift, with the crane generally provided, the mass of slag from the pot without difiiculty, the only repair requirements being to patch up the fireclay lining of the pot if necessary. However, at times the slag may so stick in the pot as to be difficult to remove in which case by knocking out the pins 39 and post 42 the side and ends of the pot may be disassembled thus leaving the slag easy of access for lifting with the crane.

Having thus described the invention, what is claimed as new is:

1. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhanging flow lip and the front wall having an opening with an edge level with the underside of Thereby there i the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges.

2. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhanging flow lip and the front wall having an opening with an edge level with the underside of the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges, said last means including corbels projecting from the side walls and engaging the upper edges of the sides of said pot. a

3. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhanging flow lip and the front wall having an opening with an edge level with the underside of the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges, said ramp means including a pair of inclined rails and the pot having rollers revolvably mounted below its bottom and resting on said rails.

4. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhanging flow lip and the front wall having an opening with an edge level with the underside of the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges, said last means including corbels projecting from the side walls and engaging the upper edges of the sides of said pot, said ramp means including a pair of inclined rails and the pot having rollers revolvably mounted below its bottom and resting on said rails.

5. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhangin' flow lip and the front wall having an opening with an edge level with the underside of the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges, said ramp means including a pair of inclined rails and the pot having rollers revolvably mounted below its bottom and resting on said rails, and stop clamps gripping said rails and engaging the forward wheels of said pot.

-6. The combination with a slag chamber having front, rear and side walls and having a floor between said walls, said rear wall having an overhanging flow lip and the front wall having an opening with an edge level with the underside of the overhanging lip; of a slag pot supported to roll in and out of its chamber, the floor of the chamber having inclined ramp means supporting said pot, and means to seal the upper edges of the pot to close the spaces between the side walls of the chamber and said upper edges, said last means including corbels projecting from the side walls and engaging the upper edges of the sides of said pot, said ramp means including a pair of inclined rails and the pot having rollers revolvably mounted below its bottom and resting on said rails, and stop clamps gripping said rails and engaging the forward wheels'of said potl 7. The combination with a slag chamber having a front Wall provided with an opening and having a ramp inclined from the rear of the chamber downwardly to the bottom of said opening, with a slag pot supported to roll on said floor, said slag not being spaced from the side walls and floor of the slag chamber whereby to provide a dead-air space for cooling the slag pot and walls of the chamber, the inner wall of said chamber being provided with a passage and having an opening leading from the chamber to the passage at the upper end of the ramp, and pull means for said slag pot including a winding drum in the passage and a chain wound on said drum, said chain extending through said opening and connected to said slag pot.

8. The combination with a slag chamber having a front wall provided with an opening and having a ramp inclined from the rear of the chamber downwardly to the bottom of said opening, with a slag pot supported to roll on said floor in combination with a treatment chamber having an inclined wall leading upwardly and forwardly to the slag chamber and providing dead-air space whereby to strengthen the furnace and slag chamber and render the production process more eflicient, the inner wall of said chamber being provided with a passage and hav ing an opening leading from the chamber to the passage at the upper end of the ramp, and pull means for said slag pot including a winding drum in the passage and a chain wound on said drum, said chain extending through said opening and connected to said slag pot.

HARRY FULTON GIBBS. GEORGE A. BRAUN. 

